You find both in the Options (F6).
In the proxy/transfer tab you have an unchecked box that will let you supply your external IP, so that the program will use it in liu of whatever internal IP you have assigned to the machine.

Well, offhand I can't give you two to try with, but there's an additional setting you can try. In the same tab-pane where you bind the ip, you can also limit what local ports to use. That could prove useful if your router is setup to limit what ports are accepted.